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    <title>Document</title>
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<body>
    <script>
        // 1. 创建 FormData 实例
        var fd = new FormData()
        // 2. 调用 append 函数，向 fd 中追加数据
        fd.append('uname', 'zs')
        fd.append('upwd', '123456')
    
        var xhr = new XMLHttpRequest()
        xhr.open('POST', 'http://www.liulongbin.top:3006/api/formdata')
        xhr.send(fd)
    
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4 && xhr.status === 200) {
            console.log(JSON.parse(xhr.responseText))
          }
        }
      </script>
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